internalcomponentmanager.java

基于Jabber协议的即时消息服务器

        return new  org.xmpp.component.Log() {
            public void error(String msg) {
                Log.error(msg);
            }

            public void error(String msg, Throwable throwable) {
                Log.error(msg, throwable);
            }

            public void error(Throwable throwable) {
                Log.error(throwable);
            }

            public void warn(String msg) {
                Log.warn(msg);
            }

            public void warn(String msg, Throwable throwable) {
                Log.warn(msg, throwable);
            }

            public void warn(Throwable throwable) {
                Log.warn(throwable);
            }

            public void info(String msg) {
                Log.info(msg);
            }

            public void info(String msg, Throwable throwable) {
                Log.info(msg, throwable);
            }

            public void info(Throwable throwable) {
                Log.info(throwable);
            }

            public void debug(String msg) {
                Log.debug(msg);
            }

            public void debug(String msg, Throwable throwable) {
                Log.debug(msg, throwable);
            }

            public void debug(Throwable throwable) {
                Log.debug(throwable);
            }
        };
    }

    /**
     * Returns the list of components that are currently installed in the server.
     * This includes internal and external components.
     *
     * @return the list of installed components.
     */
    public Collection<Component> getComponents() {
        return Collections.unmodifiableCollection(components.values());
    }

    /**
     * Retrieves the <code>Component</code> which is mapped
     * to the specified JID.
     *
     * @param componentJID the jid mapped to the component.
     * @return the component with the specified id.
     */
    public Component getComponent(JID componentJID) {
        Component component = components.get(componentJID.getDomain());
        if (component != null) {
            return component;
        }
        else {
            // Search again for those JIDs whose domain include the server name but this
            // time remove the server name from the JID's domain
            String serverName = componentJID.getDomain();
            int index = serverName.lastIndexOf("." + serverDomain);
            if (index > -1) {
                return components.get(serverName.substring(0, index));
            }
        }
        return null;
    }

    /**
     * Retrieves the <code>Component</code> which is mapped
     * to the specified JID.
     *
     * @param jid the jid mapped to the component.
     * @return the component with the specified id.
     */
    public Component getComponent(String jid) {
        return getComponent(new JID(jid));
    }

    /**
     * Registers Probeers who have not yet been serviced.
     *
     * @param prober the jid probing.
     * @param probee the presence being probed.
     */
    public void addPresenceRequest(JID prober, JID probee) {
        presenceMap.put(prober, probee);
    }

    private void checkPresences() {
        for (JID prober : presenceMap.keySet()) {
            JID probee = presenceMap.get(prober);

            Component component = getComponent(probee);
            if (component != null) {
                Presence presence = new Presence();
                presence.setFrom(prober);
                presence.setTo(probee);
                component.processPacket(presence);

                // No reason to hold onto prober reference.
                presenceMap.remove(prober);
            }
        }
    }

    /**
     *  Send a disco#info request to the new component. If the component provides information
     *  then it will be added to the list of discoverable server items.
     *
     * @param component the new component that was added to this manager.
     * @param componentJID the XMPP address of the new component.
     */
    private void checkDiscoSupport(Component component, JID componentJID) {
        // Build a disco#info request that will be sent to the component
        IQ iq = new IQ(IQ.Type.get);
        iq.setFrom(getAddress());
        iq.setTo(componentJID);
        iq.setChildElement("query", "http://jabber.org/protocol/disco#info");
        // Send the disco#info request to the component. The reply (if any) will be processed in
        // #process(Packet)
        sendPacket(component, iq);
    }

    public JID getAddress() {
        return serviceAddress;
    }

    /**
     * Processes packets that were sent to this service. Currently only packets that were sent from
     * registered components are being processed. In the future, we may also process packet of
     * trusted clients. Trusted clients may be able to execute ad-hoc commands such as adding or
     * removing components.
     *
     * @param packet the packet to process.
     */
    public void process(Packet packet) throws PacketException {
        Component component = getComponent(packet.getFrom());
        // Only process packets that were sent by registered components
        if (component != null) {
            if (packet instanceof IQ && IQ.Type.result == ((IQ) packet).getType()) {
                IQ iq = (IQ) packet;
                Element childElement = iq.getChildElement();
                String namespace = null;
                if (childElement != null) {
                    namespace = childElement.getNamespaceURI();
                }
                if ("http://jabber.org/protocol/disco#info".equals(namespace)) {
                    // Add a disco item to the server for the component that supports disco
                    Element identity = childElement.element("identity");
                    if (identity == null) {
                        // Do nothing since there are no identities in the disco#info packet
                        return;
                    }
                    try {
                        XMPPServer.getInstance().getIQDiscoItemsHandler().addComponentItem(packet.getFrom()
                                .toBareJID(),
                                identity.attributeValue("name"));
                        if (component instanceof ComponentSession.ExternalComponent) {
                            ComponentSession.ExternalComponent externalComponent =
                                    (ComponentSession.ExternalComponent) component;
                            externalComponent.setName(identity.attributeValue("name"));
                            externalComponent.setType(identity.attributeValue("type"));
                            externalComponent.setCategory(identity.attributeValue("category"));
                        }
                    }
                    catch (Exception e) {
                        Log.error("Error processing disco packet of component: " + component +
                                " - " + packet.toXML(), e);
                    }
                    // Store the IQ disco#info returned by the component
                    String subdomain = packet.getFrom().getDomain().replace("." + serverDomain, "");
                    componentInfo.put(subdomain, iq);
                    // Notify listeners that a component answered the disco#info request
                    for (ComponentEventListener listener : listeners) {
                        listener.componentInfoReceived(component, iq);
                    }
                }
            }
        }
    }

    /**
     * Exposes a Component as a RoutableChannelHandler.
     */
    public static class RoutableComponent implements RoutableChannelHandler {

        private JID jid;
        private Component component;

        public RoutableComponent(JID jid, Component component) {
            this.jid = jid;
            this.component = component;
        }

        public JID getAddress() {
            return jid;
        }

        public void process(Packet packet) throws PacketException {
            component.processPacket(packet);
        }
    }
}